Interestingly I have found the following (remember I have a M300-A and a M500-B and I don't have a vault yet): -
The M300-A will play back an imported Region A or Region B disk provided the disk is in the M500-B.
The M500-B will not play back an imported Region A disk that is in it's tray if you use the menu system (i.e select the disk, navigate to "Play Disk (Feature)" (that is the only play option) - you get the 'wrong region' message which is different on different disks (i.e it is on the disk)
The M500-B **will** play back an imported Region A disk that is in it's tray if you press the PLAY button on the remote instead !!! You can then happily resume from the disk menu (resume menu appears) and from within the resume function restart - the "Play Disk (Feature)" menu still breaks.
I have not managed to make the M500-B play a region A disk that is in it's tray if it has not been imported.
Anyway, I have now emailed Kaleiedscape support and will report back when I know more.
The fact that my M300-A actually works for playing region B leaves me rather relieved as most of my disks are region B - and also I have a method to play region A on my M500-B even though the disk has to be imported - I still can play the disk in the Region A Denon player until Tom's statement is implement
Obviously i'd like (and expected) the M500-B to be able to play Region A disks straight from the tray as I'd like to lose the Denon Region A player.
All I need now is the Vault to arrive ....
Richard